package joycai.utils.common;

import java.io.UnsupportedEncodingException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * CH工具
 */
public class ChineseUtil {

    public static boolean isChinese(char c) {
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
            return true;
        }

        return false;
    }

    /**
     * 判断是否是中文
     *
     * @param strName
     * @return
     */
    public static boolean isMessyCode(String strName) {
        Pattern p = Pattern.compile("\\s*|\t*|\r*|\n*");
        Matcher m = p.matcher(strName);
        String after = m.replaceAll("");
        String temp = after.replaceAll("\\p{P}", "");
        char[] ch = temp.trim().toCharArray();
        float chLength = 0;
        float count = 0;

        for (char c : ch) {
            if (!Character.isLetterOrDigit(c)) {
                if (!isChinese(c)) {
                    count = count + 1;
                }
                chLength++;
            }
        }

        float result = count / chLength;
        return result > 0.4;
    }

    /**
     * 乱码转中文
     *
     * @param msg
     * @return
     */
    public static String toChinese(String msg) throws UnsupportedEncodingException {
        if (isMessyCode(msg)) {
            return new String(msg.getBytes("ISO8859-1"), "UTF-8");
        }
        return msg;
    }

}